/// <summary>
        /// this function checks if the user hit the expand (+) or collapse (-) icon.
        /// if it was hit it will return true
        /// </summary>
        /// <param name="e">mouse click event arguments</param>
        /// <returns>returns true if the icon was hit, false otherwise</returns>
        internal bool IsIconHit(DataGridViewCellMouseEventArgs e)
        {
            if (e.ColumnIndex < 0)
            {
                return(false);
            }

            OutlookGrid grid      = (OutlookGrid)this.DataGridView;
            Rectangle   rowBounds = grid.GetRowDisplayRectangle(this.Index, false);
            int         x         = e.X;

            DataGridViewColumn c = grid.Columns[e.ColumnIndex];

            if (this.isGroupRow &&
                (c.DisplayIndex == 0) &&
                (x > rowBounds.Left + 4) &&
                (x < rowBounds.Left + 16) &&
                (e.Y > rowBounds.Height - 18) &&
                (e.Y < rowBounds.Height - 7))
            {
                return(true);
            }

            return(false);


            //System.Diagnostics.Debug.WriteLine(e.ColumnIndex);
        }
示例#2
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        private void InitGrid()
        {
            Columns = new ArrayList();
            Rows    = new ArrayList();

            OutlookGrid grid = (OutlookGrid)dataSource;

            // use reflection to discover all properties of the object
            foreach (DataGridViewColumn c in grid.Columns)
            {
                Columns.Add(c.Name);
            }

            foreach (OutlookGridRow r in grid.Rows)
            {
                if (!r.IsGroupRow && !r.IsNewRow)
                {
                    DataSourceRow row = new DataSourceRow(this, r);
                    for (int i = 0; i < Columns.Count; i++)
                    {
                        row.Add(r.Cells[i].Value);
                    }
                    Rows.Add(row);
                }
            }
        }
        /// <summary>
        /// the main difference with a Group row and a regular row is the way it is painted on the control.
        /// the Paint method is therefore overridden and specifies how the Group row is painted.
        /// Note: this method is not implemented optimally. It is merely used for demonstration purposes
        /// </summary>
        /// <param name="graphics"></param>
        /// <param name="clipBounds"></param>
        /// <param name="rowBounds"></param>
        /// <param name="rowIndex"></param>
        /// <param name="rowState"></param>
        /// <param name="isFirstDisplayedRow"></param>
        /// <param name="isLastVisibleRow"></param>
        protected override void Paint(System.Drawing.Graphics graphics, System.Drawing.Rectangle clipBounds, System.Drawing.Rectangle rowBounds, int rowIndex, DataGridViewElementStates rowState, bool isFirstDisplayedRow, bool isLastVisibleRow)
        {
            if (this.isGroupRow)
            {
                OutlookGrid grid            = (OutlookGrid)this.DataGridView;
                int         rowHeadersWidth = grid.RowHeadersVisible ? grid.RowHeadersWidth : 0;

                // this can be optimized
                Brush brush  = new SolidBrush(grid.DefaultCellStyle.BackColor);
                Brush brush2 = new SolidBrush(Color.FromKnownColor(KnownColor.GradientActiveCaption));

                int       gridwidth  = grid.Columns.GetColumnsWidth(DataGridViewElementStates.Displayed);
                Rectangle rowBounds2 = grid.GetRowDisplayRectangle(this.Index, true);

                // draw the background
                graphics.FillRectangle(brush, rowBounds.Left + rowHeadersWidth - grid.HorizontalScrollingOffset, rowBounds.Top, gridwidth, rowBounds.Height - 1);

                // draw text, using the current grid font
                graphics.DrawString(group.Text, grid.Font, Brushes.Black, rowHeadersWidth - grid.HorizontalScrollingOffset + 23, rowBounds.Bottom - 18);

                //draw bottom line
                graphics.FillRectangle(brush2, rowBounds.Left + rowHeadersWidth - grid.HorizontalScrollingOffset, rowBounds.Bottom - 2, gridwidth - 1, 2);

                // draw right vertical bar
                if (grid.CellBorderStyle == DataGridViewCellBorderStyle.SingleVertical || grid.CellBorderStyle == DataGridViewCellBorderStyle.Single)
                {
                    graphics.FillRectangle(brush2, rowBounds.Left + rowHeadersWidth - grid.HorizontalScrollingOffset + gridwidth - 1, rowBounds.Top, 1, rowBounds.Height);
                }

                if (group.Collapsed)
                {
                    if (grid.ExpandIcon != null)
                    {
                        graphics.DrawImage(grid.ExpandIcon, rowBounds.Left + rowHeadersWidth - grid.HorizontalScrollingOffset + 4, rowBounds.Bottom - 18, 11, 11);
                    }
                }
                else
                {
                    if (grid.CollapseIcon != null)
                    {
                        graphics.DrawImage(grid.CollapseIcon, rowBounds.Left + rowHeadersWidth - grid.HorizontalScrollingOffset + 4, rowBounds.Bottom - 18, 11, 11);
                    }
                }
                brush.Dispose();
                brush2.Dispose();
            }
            base.Paint(graphics, clipBounds, rowBounds, rowIndex, rowState, isFirstDisplayedRow, isLastVisibleRow);
        }